/Engine/Source/Editor/VREditor/Public/UI/VREditorUISystem.h
Start dragging a dock window on the hand
void StartDraggingDockUI ( class AVREditorDockableWindow * InitDraggingDockUI, [UVREditorInteractor](API\Editor\VREditor\UVREditorInteractor) * Interactor, const float DockSelectDistance, const bool bPlaySound )